Malicious PDF — malware analysis report

Static analysis result for SHA-256 43ab6453facc6085…

MALICIOUS

PDF

80.0 KB Created: 2021-03-06 01:43:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4d03108ba68f08cb342d4513f4c17344 SHA-1: 7251e7525ecb471548692275630a4b0cae5693b4 SHA-256: 43ab6453facc60851c3a4112964ed15507ad5dd17dc754ccc924f016fc3e89fc
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://xajibur.ru/123?utm_term=the+adventures+of+tom+sawyer+animated+movie PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4401692/normal_5fcbf80326327.pdfIn PDF document text
    • http://skidki-day.site/cup_song_karaoke_sing_kingpjtbz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366664/normal_5fd6a8410c2c1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402280/normal_600342855b1d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456128/normal_602acb2b0b22e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379984/normal_5fca906e9813a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372358/normal_60135fb86a739.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451356/normal_5fdc639e621e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477386/normal_602116cf2f97e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490515/normal_5fe937b9c3967.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365638/normal_5fe4d410c2529.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408348/normal_602142c9963c5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369185/normal_5ff461a3b57f9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485321/normal_5ff7f8ecd537f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417032/normal_5ff336a572c5a.pdfIn PDF document text
    • http://goodnaturak.space/android_browser_with_inbuilt_vpnd2asc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ef5db97-a02c-4b7a-a0ad-ebe5c6173760/jalin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31c91595-3710-4046-9d18-20333e9be1a7/parew.pdfIn PDF document text
    • https://eb72eaa1-ef55-40a3-a653-f6d21bccf295.filesusr.com/ugd/54913d_47b9a9f954a04ff0a5f0d15fa84a5908.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7610a6d1-aa7d-4bbe-ae06-7c83912346b9/sequences_review_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a3c1339-2f64-44c1-8fa6-3fc10dd225e5/how_do_you_know_which_atom_has_the_largest_radius.pdfIn PDF document text
    • https://c7fb3737-a2fb-4e06-b71d-f78b648bb0a4.filesusr.com/ugd/a9248e_148ac64d24a94e889437945e758a1b5d.pdf?index=trueIn PDF document text
    • https://def26600-86c9-4442-a738-094ddf2992d1.filesusr.com/ugd/eb5a6a_0f22dbb521984289b67f6973eb4baa6f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e5cab2c-7658-4ca9-ba6b-f0278afe1c5e/26790299963.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000faa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA7 5320 bytes
SHA-256: 3b2d6d2c99117987d05267bebfd7d2d26805a5423d8379f3506c379aed9ffd75
font_01_sfnt_off00010cab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAB 11008 bytes
SHA-256: e89beb2bef7d1a8ca5441c4d8e7464334d56ea42df0dd75b8d0306669ea74d3d

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